Suppression of power broadening in strong-coupling photoassociation in the presence of a Feshbach resonance

Deb, Bimalendu; Rakshit, Arpita

doi:10.1088/0953-4075/42/19/195202

Cited by 11 publications

(15 citation statements)

References 37 publications

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“…Over the last 4 years, several such experiments [42][43][44][45][46] have been carried out. The results of these experiments as well as theoretical studies [47][48][49][50][51][52][53] PA spectrum is usually determined by measuring the loss of atoms from atomic traps due to a PA laser. Once a bound state is formed in an excited molecular potential by PA process, this bound state can spontaneously decay to either two hot atoms or a bound state in ground molecular potential close to dissociation threshold.…”

Section: Nancementioning

confidence: 99%

Quantum effects at low-energy atom–molecule interface

Deb¹,

Rakshit²,

Hazra³

et al. 2013

Pramana - J Phys

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Quantum interference effects in inter-conversion between cold atoms and diatomic molecules are analysed. Within the framework of Fano's theory, continuum-bound anisotropic dressed state formalism of atom-molecule quantum dynamics is presented. This formalism is applicable in photo-and magnetoassociative strong-coupling regimes. The significance of Fano effect in ultracold atom-molecule transitions is discussed. Quantum effects at low energy atom-molecule interface are important for exploring coherent phenomena in hither-to unexplored parameter regimes.

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Section: Nancementioning

confidence: 99%

Quantum effects at low-energy atom–molecule interface

Deb¹,

Rakshit²,

Hazra³

et al. 2013

Pramana - J Phys

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“…However, here we show that, by establishing a coherence between two excited ro-vibrational levels by two lasers, it is possible to suppress this inelastic loss significantly. Previous studies [22][23][24] on Fano-Feshbach resonances in PA [22] in the presence of a MFR [25][26][27] primarily focused on controlling s-wave scattering states, suppression of inelastic scattering [23], and control over power broadening [24]. The present work is basically concerned with optical manipulation of the anisotropic atom-atom interaction.…”

Section: Introductionmentioning

confidence: 98%

Resonant manipulation ofd-wave interaction of cold atoms with two lasers and a magnetic field

Deb

2012

Phys. Rev. A

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We present a theory for manipulation of d-wave interaction of cold atoms with two lasers strongly driving two photoassociative transitions. The theory predicts the occurrence of a coherence between two excited ro-vibrational bound states due to the photoassociative dipole couplings of ground-state d-wave scattering state to the bound states. We show that this excited-state coherence significantly influences atom-atom interaction. In particular, this leads to the enhancement of d-wave elastic scattering and to the suppression of inelastic scattering. In the presence of an s-wave magnetic Feshbach resonance, the two lasers can couple the s-wave resonance with the d-wave scattering state, leading to the further enhancement in d-wave scattering at relatively low energy. Our numerical calculations based on realistic parameters show that d-wave manipulation would be most effective in case of atoms having excited diatomic states with narrow natural linewidth. We estimate that at an energy of 100 μK the inelastic scattering rate in Yb can be reduced to 20 s −1 while the elastic scattering rate can be two orders of magnitude larger.

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“…OFR has been demonstrated in recent experiments [17,18,19]. Recently, PA spectroscopy in the presence of an MFR has attracted a lot of attention both experimentally [20,21,22,23] and theoretically [24,25,26,27,28]. Junker et al [20] have observed asymmetric profile in PA spectrum under the influence of an MFR.…”

Section: Introductionmentioning

confidence: 99%

Magneto-optical Feshbach resonance: controlling cold collision with quantum interference

Deb

2010

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. We propose a method of controlling two-atom interaction using both magnetic and laser fields. We analyse the role of quantum interference between magnetic and optical Feshbach resonances in controlling cold collision. In particular, we demonstrate that this method allows us to suppress inelastic and enhance elastic scattering cross sections. Quantum interference is shown to modify significantly the threshold behaviour and resonant interaction of ultracold atoms. Furthermore, we show that it is possible to manipulate not only the spherically symmetric swave interaction but also the anisotropic higher partial-wave interactions which are particularly important for high temperature superfluid or superconducting phases of matter.

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Suppression of power broadening in strong-coupling photoassociation in the presence of a Feshbach resonance

Cited by 11 publications

References 37 publications

Quantum effects at low-energy atom–molecule interface

Quantum effects at low-energy atom–molecule interface

Resonant manipulation ofd-wave interaction of cold atoms with two lasers and a magnetic field

Magneto-optical Feshbach resonance: controlling cold collision with quantum interference

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